What are some alternatives?
When comparing Astroburn and Free ISO Burner, you can also consider the following products
ImgBurn - What in the Heck is IMG Burn? We all need to copy discs from time to time.
CDBurnerXP - Free CD, DVD, ISO, HD-DVD and Blu-Ray burning software with multi-language interface. Everyone, even companies, can use it for free.
AnyBurn - AnyBurn is a light weight but professional free CD / DVD / Blu-ray burning software
ISOburn - ISOburn can directly burn your ISO and CD/DVD image file to CD-R,CD-RW, DVD-R, DVD-RW, DVD+R...
Brasero - Brasero is an application to burn CD/DVD for the Gnome Desktop.
UltraISO - CD image files are easily created with UltraISO.